This paper provides an overview of Bluetooth Low Energy (BLE), a low-power wireless technology designed for short-range control and monitoring applications. BLE is expected to be integrated into billions of devices in the near future, leveraging the widespread use of classic Bluetooth. The paper discusses the main features of BLE, including its protocol stack, energy consumption, latency, piconet size, and throughput. It explores the impact of critical parameters such as connInterval and connSlaveLatency on these performance metrics. Theoretical and experimental results show that BLE offers a trade-off between energy efficiency, latency, and network size, with device lifetimes ranging from 2.0 days to 14.1 years. The paper also evaluates the maximum piconet size and application layer throughput, and compares BLE with other low-power wireless technologies like ZigBee, 6LoWPAN, and Z-Wave. BLE is highlighted as a strong candidate for single-hop communication in various applications, including healthcare, consumer electronics, smart energy, and security, particularly in the context of the Internet of Things (IoT).This paper provides an overview of Bluetooth Low Energy (BLE), a low-power wireless technology designed for short-range control and monitoring applications. BLE is expected to be integrated into billions of devices in the near future, leveraging the widespread use of classic Bluetooth. The paper discusses the main features of BLE, including its protocol stack, energy consumption, latency, piconet size, and throughput. It explores the impact of critical parameters such as connInterval and connSlaveLatency on these performance metrics. Theoretical and experimental results show that BLE offers a trade-off between energy efficiency, latency, and network size, with device lifetimes ranging from 2.0 days to 14.1 years. The paper also evaluates the maximum piconet size and application layer throughput, and compares BLE with other low-power wireless technologies like ZigBee, 6LoWPAN, and Z-Wave. BLE is highlighted as a strong candidate for single-hop communication in various applications, including healthcare, consumer electronics, smart energy, and security, particularly in the context of the Internet of Things (IoT).